diff --git a/core/main.mk b/core/main.mk
index 3c4dd9ab7d..6ff5f93e9d 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1033,6 +1033,8 @@ endif
 
 ifdef FULL_BUILD
   product_FILES := $(call product-installed-files, $(INTERNAL_PRODUCT))
+  # WARNING: The product_MODULES variable is depended on by external files.
+  product_MODULES := $(_pif_modules)
 
   # Verify the artifact path requirements made by included products.